( function () {
/**
 * Luminosity
 * http://en.wikipedia.org/wiki/Luminosity
 */

const LuminosityHighPassShader = {
  shaderID: 'luminosityHighPass',
  uniforms: {
    'tDiffuse': {
      value: null
    },
    'luminosityThreshold': {
      value: 1.0
    },
    'smoothWidth': {
      value: 1.0
    },
    'defaultColor': {
      value: new THREE.Color(0x000000)
    },
    'defaultOpacity': {
      value: 0.0
    }
  },
  vertexShader:
  /* glsl */
  `

		varying vec2 vUv;

		void main() {

			vUv = uv;

			gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );

		}`,
  fragmentShader:
  /* glsl */
  `

		uniform sampler2D tDiffuse;
		uniform vec3 defaultColor;
		uniform float defaultOpacity;
		uniform float luminosityThreshold;
		uniform float smoothWidth;

		varying vec2 vUv;

		void main() {

			vec4 texel = texture2D( tDiffuse, vUv );

			vec3 luma = vec3( 0.299, 0.587, 0.114 );

			float v = dot( texel.xyz, luma );

			vec4 outputColor = vec4( defaultColor.rgb, defaultOpacity );

			float alpha = smoothstep( luminosityThreshold, luminosityThreshold + smoothWidth, v );

			gl_FragColor = mix( outputColor, texel, alpha );

		}`
};

THREE.LuminosityHighPassShader = LuminosityHighPassShader;
} )();
